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packages/quiver/test/collection/delegates/iterable_test.dart

+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+library quiver.collection.delegates.iterable_test;
+
+import 'package:quiver/collection.dart';
+import 'package:test/test.dart';
+
+class MyIterable extends DelegatingIterable<String> {
+  final Iterable<String> _delegate;
+
+  MyIterable(this._delegate);
+
+  Iterable<String> get delegate => _delegate;
+}
+
+void main() {
+  group('DelegatingIterable', () {
+    DelegatingIterable<String> delegatingIterable;
+
+    setUp(() {
+      delegatingIterable = new MyIterable(['a', 'b', 'cc']);
+    });
+
+    test('any', () {
+      expect(delegatingIterable.any((e) => e == 'b'), isTrue);
+      expect(delegatingIterable.any((e) => e == 'd'), isFalse);
+    });
+
+    test('contains', () {
+      expect(delegatingIterable.contains('b'), isTrue);
+      expect(delegatingIterable.contains('d'), isFalse);
+    });
+
+    test('elementAt', () {
+      expect(delegatingIterable.elementAt(1), equals('b'));
+    });
+
+    test('every', () {
+      expect(delegatingIterable.every((e) => e is String), isTrue);
+      expect(delegatingIterable.every((e) => e == 'b'), isFalse);
+    });
+
+    test('expand', () {
+      expect(delegatingIterable.expand((e) => e.codeUnits),
+          equals([97, 98, 99, 99]));
+    });
+
+    test('first', () {
+      expect(delegatingIterable.first, equals('a'));
+    });
+
+    test('firstWhere', () {
+      expect(delegatingIterable.firstWhere((e) => e == 'b'), equals('b'));
+      expect(delegatingIterable.firstWhere((e) => e == 'd', orElse: () => 'e'),
+          equals('e'));
+    });
+
+    test('fold', () {
+      expect(delegatingIterable.fold('z', (p, e) => p + e), equals('zabcc'));
+    });
+
+    test('forEach', () {
+      final s = new StringBuffer();
+      delegatingIterable.forEach((e) => s.write(e));
+      expect(s.toString(), equals('abcc'));
+    });
+
+    test('isEmpty', () {
+      expect(delegatingIterable.isEmpty, isFalse);
+      expect(new MyIterable([]).isEmpty, isTrue);
+    });
+
+    test('isNotEmpty', () {
+      expect(delegatingIterable.isNotEmpty, isTrue);
+      expect(new MyIterable([]).isNotEmpty, isFalse);
+    });
+
+    test('forEach', () {
+      final it = delegatingIterable.iterator;
+      expect(it.current, isNull);
+      expect(it.moveNext(), isTrue);
+      expect(it.current, equals('a'));
+      expect(it.moveNext(), isTrue);
+      expect(it.current, equals('b'));
+      expect(it.moveNext(), isTrue);
+      expect(it.current, equals('cc'));
+      expect(it.moveNext(), isFalse);
+      expect(it.current, isNull);
+    });
+
+    test('join', () {
+      expect(delegatingIterable.join(), equals('abcc'));
+      expect(delegatingIterable.join(','), equals('a,b,cc'));
+    });
+
+    test('last', () {
+      expect(delegatingIterable.last, equals('cc'));
+    });
+
+    test('lastWhere', () {
+      expect(delegatingIterable.lastWhere((e) => e == 'b'), equals('b'));
+      expect(delegatingIterable.lastWhere((e) => e == 'd', orElse: () => 'e'),
+          equals('e'));
+    });
+
+    test('length', () {
+      expect(delegatingIterable.length, equals(3));
+    });
+
+    test('map', () {
+      expect(delegatingIterable.map((e) => e.toUpperCase()),
+          equals(['A', 'B', 'CC']));
+    });
+
+    test('reduce', () {
+      expect(delegatingIterable.reduce((value, element) => value + element),
+          equals('abcc'));
+    });
+
+    test('single', () {
+      expect(() => delegatingIterable.single, throws);
+      expect(new MyIterable(['a']).single, equals('a'));
+    });
+
+    test('singleWhere', () {
+      expect(delegatingIterable.singleWhere((e) => e == 'b'), equals('b'));
+      expect(() => delegatingIterable.singleWhere((e) => e == 'd'), throws);
+    });
+
+    test('skip', () {
+      expect(delegatingIterable.skip(1), equals(['b', 'cc']));
+    });
+
+    test('skipWhile', () {
+      expect(
+          delegatingIterable.skipWhile((e) => e == 'a'), equals(['b', 'cc']));
+    });
+
+    test('take', () {
+      expect(delegatingIterable.take(1), equals(['a']));
+    });
+
+    test('skipWhile', () {
+      expect(delegatingIterable.takeWhile((e) => e == 'a'), equals(['a']));
+    });
+
+    test('toList', () {
+      expect(delegatingIterable.toList(), equals(['a', 'b', 'cc']));
+    });
+
+    test('toSet', () {
+      expect(delegatingIterable.toSet(),
+          equals(new Set<String>.from(['a', 'b', 'cc'])));
+    });
+
+    test('where', () {
+      expect(
+          delegatingIterable.where((e) => e.length == 1), equals(['a', 'b']));
+    });
+  });
+}